Less than a day ago, sunspot AR1678 didn't exist. Now it is three times wider than our entire planet. NASA Solar Dynamics Observatory recorded the sunspot's rapid development: [go to www.spaceweather.com to watch sunspot developing]

Sunspots are islands of magnetism that float on the surface of the sun. This one is emerging from depth and changing at such a rapid pace that its magnetic field is likely unstable. A reconnection event in AR1678's magnetic canopy could lead to a significant solar flare. Stay tuned! www.spaceweather.com